/* * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */#ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP#define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP#include "utilities/macros.hpp"#if INCLUDE_ALL_GCS#include "gc_implementation/g1/g1MonitoringSupport.hpp"#include "services/memoryPool.hpp"#include "services/memoryUsage.hpp"#endif // INCLUDE_ALL_GCS// This file contains the three classes that represent the memory// pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and// G1OldGenPool. In G1, unlike our other GCs, we do not have a// physical space for each of those spaces. Instead, we allocate// regions for all three spaces out of a single pool of regions (that// pool basically covers the entire heap). As a result, the eden,// survivor, and old gen are considered logical spaces in G1, as each// is a set of non-contiguous regions. This is also reflected in the// way we map them to memory pools here. The easiest way to have done// this would have been to map the entire G1 heap to a single memory// pool. However, it's helpful to show how large the eden and survivor// get, as this does affect the performance and behavior of G1. Which// is why we introduce the three memory pools implemented here.//// See comments in g1MonitoringSupport.hpp for additional details// on this model.//// This class is shared by the three G1 memory pool classes// (G1EdenPool, G1SurvivorPool, G1OldGenPool).class G1MemoryPoolSuper : public CollectedMemoryPool {protected: const static size_t _undefined_max = (size_t) -1; G1MonitoringSupport* _g1mm; // Would only be called from subclasses. G1MemoryPoolSuper(G1CollectedHeap* g1h, const char* name, size_t init_size, size_t max_size, bool support_usage_threshold);};// Memory pool that represents the G1 eden.class G1EdenPool : public G1MemoryPoolSuper {public: G1EdenPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return _g1mm->eden_space_used(); } size_t max_size() const { return _undefined_max; } MemoryUsage get_memory_usage();};// Memory pool that represents the G1 survivor.class G1SurvivorPool : public G1MemoryPoolSuper {public: G1SurvivorPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return _g1mm->survivor_space_used(); } size_t max_size() const { return _undefined_max; } MemoryUsage get_memory_usage();};// Memory pool that represents the G1 old gen.class G1OldGenPool : public G1MemoryPoolSuper {public: G1OldGenPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return _g1mm->old_space_used(); } size_t max_size() const { return _g1mm->old_gen_max(); } MemoryUsage get_memory_usage();};#endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP